There is a group of 40 people from 4 countries, 10 from each country. (a) Determine the number of ways a committee of 5 people can be formed if everybody in the committee must be from the same country.
(b) Determine the number of ways a committee of 5 people can be formed if at least two countries must appear in the committee.

Data for the height of a model rocket launch in the air over time are shown in the table. darryl predicted that the height of the rocket at 8 seconds would be about 93 meters. did darryl make a good prediction? yes, the data are best modeled by a quadratic function. the value of the function at 8 seconds is about 93 meters. yes, the data are best modeled by a linear function. the first differences are constant, so about 93 meters at 8 seconds is reasonable. no, the data are exponential. a better prediction is 150 meters. no, the data are best modeled by a cubic function. a better prediction is 100 meters.

If the perimeter of the square equals the perimeter of the regular pentagon. each side of a pentagon is 16cm long. how long is each side of the square?

The sum of five and a number n is at least 12